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Upon returning, hit a Hidden Block between two coins to get a Super Mushroom or Fire Flower. Just before it reaches the lava, run off it and enter the Warp Pipe leading to the second bonus room. Take your time as you cross the next set of cogs, and make sure you stay in an indentation when you reach the final cog. Use the same method for the next section, staying out of the lava, and continue on to the platform with a Dry Bones on it.
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Cross the cog and carefully jump onto the edge of the platform, out of the range of the Thwomp. Activate the Red Coin Ring, and do not stop running as you collect the coins.
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Wait for the third Thwomp to come down before jumping up to the next part of the path. Let the next Giant Thwomp smash the blocks, then take the lower path. Duck and wait for it to smash again before exiting that area. When you get to the Giant Thwomp, let it smash the blocks before you retrieve the second Star Coin. Avoid the Thwomps by waiting to move until they've already attempted to squash you and are returning upwards. Jump across the next group of cogs and activate the midway flag. Jump back on to the upper cog, and ride it reach the first bonus room. Continue, hitting the ? Block to release a Super Mushroom or Ice Flower. Jump into the next set of cogs, staying in the indentation to avoid being crushed. Drop down onto the cog, then jump into the Star Coin, landing on the platform with a Dry Bones. Then jump onto a high platform and collect the coins on it. Cross another cog, then jump on one of the spokes on the next cog and ride it up. Jump across the cog, then hit the ? Block for a Super Mushroom or Ice Flower.
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